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    <p>
      An <em>IfcTableColumn</em> is a data structure that captures
      column information for use in an <em>IfcTable</em>. Each
      instance defines the identifier, name, description, and units
      of measure that are applicable to the columnar data
      associated with the <em>IfcTableRow</em> objects.
    </p>
    <p>
      The use of <em>IfcTableColumn</em> supersedes the
      <em>IsHeading</em> flag associated with <em>IfcTableRow</em>.
    </p>
    <blockquote class="history">
      HISTORY&nbsp; New entity in IFC4.
    </blockquote>
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